An anonymous reader writes: Mozilla is following through with its accelerated release plan, The company just confirmed that the posted 4.2a1pre versions are, in fact, already Firefox 5 builds and time constraints did not allow Mozilla to use the version number 5.0a1pre. The new schedule foresees Firefox 5 to move into a public stable channel on April 13. The expected changes in this version are UI revisions that will desktop web apps, besides the already annoucned revisions to the JavaScript engine for ECMAScript 5.